Could you save by switching to a renewable energy supplier?

How green is your energy? 

We’ve teamed up with Connect Earth to investigate the best options for greener energy suppliers. 

Before we get into our findings, let’s quickly recap why finding a green energy supplier can make such a big impact to your carbon footprint.

How big is your carbon footprint?

Energy is usually produced by the combustion of fossil fuels, a process that releases large amounts of carbon dioxide, a greenhouse gas, into the air. 

Greenhouse gases trap heat in our atmosphere, causing global warming. Global warming can lead to sea level rise, extreme weather, biodiversity loss and species extinction, as well as food scarcity, worsening health and poverty for millions of people worldwide. But it doesn’t have to be this way.

Thanks to improvements in technology, it can be cheaper to produce renewable energy than to stick with fossil fuels. This is especially the case in 2022 considering the large increases in fossil fuel prices. According to the latest IRENA report, the lifetime per kWh costs of new solar and wind electricity projects could on average be four to six times lower than electricity production costs from existing gas plants due to the high fossil fuel prices. The global additions of renewable electricity production capacity in 2021 (257 GW) could potentially save as much as $55 billion in global electricity generation costs in 2022. Another report recently found that a fast transition to clean energies could soon result in a $514 billion global annual saving on energy.

We’ve been working with Connect Earth to search for the greenest energy supplier, using a variety of factors to evaluate your options. 

Connect Earth + Tide

Tide and Connect Earth have joined forces to find simple ways for Tide members to reduce their carbon footprint and, at the same time, reduce costs and/or offer a better experience for their customers.

Connect Earth is an environmental data company that uses your banking data to calculate your carbon footprint. After analysing the transaction data, we can see that many of Tide’s customers could save by switching to green energy suppliers.

Connect Earth also collects the emissions figure that companies report. They can then calculate an emissions factor that considers other factors like the size of the company, the number of employees, and the type of business activities the company performs. This allows them to make a fair comparison of two or more companies’ carbon performance.

The best green energy deals

After folding together the banking data and the analysis from Connect Earth, we can offer clear recommendations about the best green energy suppliers. Of course, you’ll need to also compare how their deals stack up against your current provider and the cost implications of switching.  

Here’s our top 5.

Octopus Energy

“All our electricity comes from 100% renewable sources like sun, wind, and water” 

Analysis: Low spend-based emissions intensity factor* compared to the sample of UK energy companies analysed by Connect Earth.

Ovo Energy

“100% renewable electricity as standard”

Ovo also plants a tree for each member per year, and they offer smart meters to help consumer reduce their CO2 impact. 

Analysis: Low spend-based emissions intensity factor* compared to the sample of UK energy companies analysed by Connect Earth.


“All our electricity is certified green, and also certified vegan. Our gas is a mix of carbon-neutralised natural gas and sustainable green gas

Ecotricity were named as one of the greenest energy suppliers in the UK by Which?.

Analysis: Low spend-based emissions intensity factor* compared to the sample of UK energy companies analysed by Connect Earth.

Good Energy

Good Energy supports independent electricity providers across the UK. They have helped more than 1,600 energy providers and supported the UK to access renewable energy at fair prices. 

Together with Gold Standard, the company is promoting carbon-neutral gas projects around the world. 

Analysis: Low spend-based emissions intensity factor* compared to the sample of UK energy companies analysed by Connect Earth.

Green Energy UK (GEUK)

“We are the UK’s only supplier of 100% green gas and renewable electricity” 

Ranked by Ethical Consumer as the UK’s ‘best buy’ and awarded the Which? Eco Provider badge,

the company allows consumers to choose their green tariffs. Their energy comes from sustainable projects all over the UK. Their EKO Energy Tariff also aims to be ethical by protecting marine and bird habitats.

Analysis: Green Energy do not report their emissions, but, they are the only supplier with 100% green gas and renewable electricity.

* The spend-based emissions factor is calculated by Connect Earth using available Scope 1 and Scope 2 GHG emissions as well as financial figures. Note also that this evaluation is limited to the data at Connect Earth’s disposal at the time of research and what was considered appropriate for comparison. Real emissions intensities can vary according to reporting boundaries, methodology and financial figures reported and used within the analysis. 

A note about green energy

Green energy suppliers are making a genuine difference to the de-carbonisation of the National Grid. However, it’s important to note that the energy flowing through the grid is a mixture of energy from multiple sources. There is no way to separate renewable electrons from non-renewable as they flow into your home or premises.

The green energy suppliers listed here are all making efforts to increase our use of renewable energy, while also investing in a variety of environmental initiatives. Choosing green energy suppliers also encourages a greater reliance on renewable energy sources, which may help influence policymakers and help society move to a brighter future. 

Go green with Tide

While our main mission is to help you grow your business by giving you the best tools to manage your money, we know that our future depends on the world becoming more sustainable in all domains of life and work. 

With this in mind, we’re delighted to partner with Connect Earth to shine a light on the environmental impact of typical business spending. 

As well as helping our members make green choices, here at Tide we are working towards being Net Zero. Stay tuned for more information on this, and other insights from our collaboration with Connect Earth in due course.

Caroline Wire

Caroline Wire

Senior Small Business Copywriter

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